No suitable driver

public class Repositorio{

 private static boolean DEBUG = false;
 private final String driver = "driver";
 private static final String url = "url de conexao com o banco";
 private static final String usuario = "login";
 private static final String senha = "senha";
 private static Repositorio rep = new Repositorio();

public Repositorio() {
    try{
      Class.forName(driver);                           //construtor
    }catch(ClassNotFoundException cex){
      System.out.println("Erro com o driver");
    }
  } 


public class getConnection() throws SQLException{
Connection connection = null;
try{
    connection = DriverManager.getConnection(url,user,senha);
  }
  catch( SQLException sex ) {
       throw new SQLException(sex.getMessage());
  }
  return connection;
 }
}